Improvement of expansive soils by using cement kiln dust

Yılmaz, Mehmet Kağan
Expansive soils are a worldwide problem that poses several challenges for civil engineers. Such soils swell when given an access to water and shrink when they dry out. The most common and economical method for stabilizing these soils is using admixtures that prevent volume changes. In this study, effect of using cement kiln dust (CKD) in reducing the swelling potential was examined. The expansive soil was prepared in the laboratory by mixing kaolinite and bentonite. Cement kiln dust (CKD) was added to the soil at 0 to 12 percent by weight. Grain size distribution, Atterberg limits and swell percent and rate of swell of the mixtures was determined. Specimens were cured for 7 and 28 days. As a result of the experimental study, the effect of cement kiln dust (CKD) on swelling potential and rate of swell of the artificially prepared expansive soil specimen at laboratory conditions was seen. Tests were repeated with lime (3%, 6% and 9%), cement (3%, 6% and 9%) and sand (3%, 6%, 9%, 12% and 15%) instead of CKD for comparison. With the addition of 12 % cement kiln dust, swell percentage of expansive soil decreased from 36.63 % to 6.74 % without curing, from 35.58 % to 6.32 % with 7 days curing and from 33.63 % to 6.00 % with 28 days curing. Based on the favorable results obtained, it can be concluded that the expansive soil can be successfully stabilized by cement kiln dust.
Citation Formats
M. K. Yılmaz, “Improvement of expansive soils by using cement kiln dust,” M.S. - Master of Science, Middle East Technical University, 2014.